英音 [ˈdʌbl] 美音 [ˈdʌbəl]
a base hit on which the batter stops safely at second base;
"he hit a double to deep centerfield"
a stand-in for movie stars to perform dangerous stunts;
"his first job in Hollywood was as a double for Clark Gable"
someone who closely resembles a famous person (especially an actor);
"he could be Gingrich's double"
"she's the very image of her mother"
a quantity that is twice as great as another;
"36 is the double of 18"
raising the stakes in a card game by a factor of 2;
"I decided his double was a bluff"
having more than one decidedly dissimilar aspects or qualities;
"a double (or dual) role for an actor"
"the office of a clergyman is twofold; public preaching and private influence"
"every episode has its double and treble meaning"
consisting of or involving two parts or components usually in pairs;
"an egg with a double yolk"
"a double (binary) star"
"dual controls for pilot and copilot"
"duple (or double) time consists of two (or a multiple of two) beats to a measure"
twice as great or many;
"ate a double portion"
"the dose is doubled"
"a twofold increase"
used of flowers having more than the usual number of petals in crowded or overlapping arrangements;
"double chrysanthemums have many rows of petals and are usually spherical or hemispherical"
used of homologous chromosomes associated in pairs in synapsis
large enough for two;
"a double bed"
"a double room"
having two meanings with intent to deceive;
"a sly double meaning"
"spoke with forked tongue"
downward and forward;
"he was bent double with pain"
"some people sleep better double"
to double the degree;
"she was doubly rewarded"
"his eyes were double bright"
"The population doubled within 50 years"
hit a two-base hit
bend over or curl up, usually with laughter or pain;
"He doubled and vomited violently"
do double duty; serve two purposes or have two functions;
"She doubles as his wife and secretary"
bridge: make a demand for (a card or suit)
make or do or perform again;
"He could never replicate his brilliant performance of the magic trick"
doubler n. 加倍装置，大碗;
doublespeak n. 胡扯;欺人之谈;故弄玄虚的言词;
doublet n. 紧身上衣，成对的东西;
doublethink n. 思想矛盾;
doubleton n. 双张（指所发13张牌中某一花色仅两张的牌），双张中的一张牌;
doubletree n. （用双马拉车等时使用的）双驾横木;
redouble vt.& vi. 进一步加强，大大增加; vi. 再加倍，翻两番;
undouble v. （使）不再对折;（使）展开;（使）不再握紧;（使）松开;
double or quits double 要么加倍付钱，要么全部勾销;
double or nothing double 要么加倍付钱，要么全部勾销;
double dog 双制动爪;
double plate 双夹板;
double scale 双刻度，二重标度;
double goniometer 双向测向计，双向测角计;
double image 重像，双像，回波图像;重影;
double circulation 双重循环;
double cyclone 双级旋风分离器;
double staining 双重着色;
double ratio 交比;
double double radio source 双双射电源;
double helical double helix 双螺旋形的双螺旋;
double-double effect 双偶效应;
double-pole double-throw [化] 双刀双掷，双刀双掷开关;
double-double iron shect 叠轧铁板;
double double iron 八叠板;
double Tiron 工字铁;
double profile 重复断面（即河川横断面两个以上阶段为二重断面）;
double fracture 两处骨折，双骨折;
double malformation 重复畸形;
double samara [医]双翅果;